. >>> at 11:00 p.m. on may 1, 2011 00:21 20111, two blackhawks, a translator, 23 navy s.e.a.l.s and a dog named cairo took off from jalalabad, afghanistan. the mission, to kill the world's most wanted man, osama bin ladin. >> the death of bin laden mark it is most significant achievement to date in our nation's effort to defeat al qaeda. >> most have heard the incredible details of the compound raid, but little has been revealed about the intense months-long deliberation that led to the final decision to act. so how was the decision made? who was told? how did they weigh the options? tonight we will ask the men tasked by the president to synthesize the intelligence, analyze the assessments and run the decision making process, to act, in a sense, as gatekeeper of this monumental decision. i sat down with national security adviser follow donlin in the eisenhower executive office building. when you come into the white house, has the trail for osama bin ladin gone cold? >> when we came into office at the beg